Which side of this proton transfer reaction is favored at equilibrium? Ö: HO: (Na* spectator ion is not shown.) OH Reactants (left side) Products (right side) Neither side is favored H₂O:

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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### Understanding Proton Transfer Reactions and Equilibrium

#### Question:
Which side of this proton transfer reaction is favored at equilibrium?

#### Chemical Reaction:
\[ \begin{array}{c}
\mathrm{CH_3(CH_2)_2COOH} + \mathrm{OH^-} \rightleftharpoons \mathrm{CH_3(CH_2)_2COO^-} + \mathrm{H_2O} \\
\end{array} \]

*Note: The \( \mathrm{Na^+} \) spectator ion is not shown.*

#### Options:
1. **Reactants (left side)**
2. **Products (right side)**
3. **Neither side is favored**

#### Explanation of the Reaction:
This is a proton transfer reaction. Here's a breakdown of the components:

1. **Reactants (left side):**
   - **Propanoic acid (\( \mathrm{CH_3(CH_2)_2COOH} \))**: A carboxylic acid.
   - **Hydroxide ion (\( \mathrm{OH^-} \))**: A strong base, typically derived from alkali.

2. **Equilibrium Arrows**: Indicate that the reaction can proceed in both forward and backward directions until equilibrium is established.

3. **Products (right side):**
   - **Propanoate ion (\( \mathrm{CH_3(CH_2)_2COO^-} \))**: The conjugate base of the propanoic acid.
   - **Water (\( \mathrm{H_2O} \))**: Formed by the protonation of the hydroxide ion.

#### Analyzing the Equilibrium:
- **Acid-Base Strengths**: The reaction equilibrium is influenced by the relative strengths of the acids and bases involved.
  - **Propanoic acid** is a weak acid, whereas **hydroxide ion** is a strong base.
  - **Water** is a weak acid when compared to the hydroxide ion.
- The equilibrium generally favors the formation of the weaker acid and base. Given that water is weaker (less likely to donate a proton) than propanoic acid, the equilibrium will likely shift towards the products.

#### Conclusion:
Hence, the side favored at equilibrium for this reaction is:

**[Products (right side)]**

By understanding the relative strengths of the acids and bases, one can determine
Transcribed Image Text:### Understanding Proton Transfer Reactions and Equilibrium #### Question: Which side of this proton transfer reaction is favored at equilibrium? #### Chemical Reaction: \[ \begin{array}{c} \mathrm{CH_3(CH_2)_2COOH} + \mathrm{OH^-} \rightleftharpoons \mathrm{CH_3(CH_2)_2COO^-} + \mathrm{H_2O} \\ \end{array} \] *Note: The \( \mathrm{Na^+} \) spectator ion is not shown.* #### Options: 1. **Reactants (left side)** 2. **Products (right side)** 3. **Neither side is favored** #### Explanation of the Reaction: This is a proton transfer reaction. Here's a breakdown of the components: 1. **Reactants (left side):** - **Propanoic acid (\( \mathrm{CH_3(CH_2)_2COOH} \))**: A carboxylic acid. - **Hydroxide ion (\( \mathrm{OH^-} \))**: A strong base, typically derived from alkali. 2. **Equilibrium Arrows**: Indicate that the reaction can proceed in both forward and backward directions until equilibrium is established. 3. **Products (right side):** - **Propanoate ion (\( \mathrm{CH_3(CH_2)_2COO^-} \))**: The conjugate base of the propanoic acid. - **Water (\( \mathrm{H_2O} \))**: Formed by the protonation of the hydroxide ion. #### Analyzing the Equilibrium: - **Acid-Base Strengths**: The reaction equilibrium is influenced by the relative strengths of the acids and bases involved. - **Propanoic acid** is a weak acid, whereas **hydroxide ion** is a strong base. - **Water** is a weak acid when compared to the hydroxide ion. - The equilibrium generally favors the formation of the weaker acid and base. Given that water is weaker (less likely to donate a proton) than propanoic acid, the equilibrium will likely shift towards the products. #### Conclusion: Hence, the side favored at equilibrium for this reaction is: **[Products (right side)]** By understanding the relative strengths of the acids and bases, one can determine
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